How long do you really use a diaper bag?

Kelani

I have a 2 year toddler and a 6MO baby I use a tote bag I hate it cause the bottles are always spilling and it smells afterwards when it drips inside. I have been looking for diaper bags but idk for long I will use it for? Will it be worth buying? I low key want a small one idk I feel some are super huge. But idk if I should get one or not? Plse help